Influence
of preparation conditions on thermal properties of lanthanide benzenepolycarboxylates |
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Authors: | M Iwan R Łyszczek A Ostasz Z Rzączyńska |
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Institution: | (1) Department of General and Coordination Chemistry, Faculty of Chemistry UMCS, Lublin, Poland, 20-031, Maria Curie Skłodowska Sq.2 |
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Abstract: | Properties of lanthanide 1,2,4-benzenetricarboxylates and lanthanide
1,2,4,5-benzenetetracarboxylates obtained by a classical synthesis method
and under hydrothermal conditions were compared. Solid 1,2,4-benzenetricarboxylates
and 1,2,4,5-benzenetetracarboxylates of cerium, neodymium and erbium were
prepared by a classical precipitation method. The same lanthanide compounds
were obtained also from hydrothermal reaction. All obtained products were
examined by elemental analysis. General formulae of complexes were: Ln(1,2,4-btc)·xH2O and Ln4(1,2,4,5-btec)3·yH2O. The thermal analysis
shows that hydrothermal conditions cause the coordination of less number of
water molecules to complex molecule. Because lanthanide ions exhibit the most
often the coordination number equal 8 or 9 one can conclude that the coordination
ability of carboxylic groups under hydrothermal conditions is different from
that under mild ones. Probably, in hydrothermal conditions the carboxylic
groups of 1,2,4-benzenetricarboxylate ions are able to form more coordination
bonds with lanthanide ions than under normal pressure. |
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Keywords: | 1 2 4 5-benzenetetracarboxylates 1 2 4-benzenetricarboxylates hydrothermal synthesis lanthanide complexes |
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